Question

6. What is the advantage of producing pollen over having motile sperm cells? 7. What are the two types of vascular tissue found in plants? What do they transport? 8. Why are Bryophytes still dependent on water more so than other land plants (Hint- think about adaptations they LACK)? 9. What are the similarities between Division Bryophyta and the Seedless Vascular plants?

Answer 1

6. Plants are immobile and to transfer their gamete to large distances they produce pollen which are resistant to the environmental stresses which will be faced by it during transfer to the female plant . The gamete is present inside that pollen whereas motile sperm cells are quite vulnerable so they need a protective environment to move like in case of humans , sperms have female body which block the environment stresses

7. Two types are - Xylem and Phloem

Xylem - transports water and some nutrients

Phloem- transports food

8. They are dependent on water as they need moist environment to survive and reproduce and lack adaptations to survive on land without moist environment.

9. Both need water for fertilization and require moist places to grow.

12. Staminate cones produce male gametes which has to be in bulk and also smaller the size , lesser it will be disturbed by the environment whereas ovulate cones are large so as to easily grab the pollen which contains the male gamete because the bigger it is , the more pollen it will be able to catch.

13. The purpose of pollen grain is to safely transfer the male gamete from the male parent to the female parent so that it can reproduce that is why it is hard , so as to overcome the environmental stresses